Kowa's 6x6 SLR with multiple exposure — leaf-shutter lenses, full flash sync, 1972.
The Kowa Six MM is an early-1970s medium-format SLR, a revision of the Kowa Six that added a multiple-exposure capability, giving the model its 'MM' designation. It continued Kowa's approach of a fixed 6x6 body with interchangeable leaf-shutter lenses as a lower-cost square-format system.
It is a medium-format (6x6) SLR producing a 56x56mm square frame on 120 or 220 film in a fixed body without removable backs. It uses leaf shutters built into each lens for flash sync at all speeds and adds a multiple-exposure function over the original Six. It takes interchangeable waist-level or prism finders and focusing screens and mounts Kowa Six bayonet lenses; there is no built-in meter.
The multiple-exposure feature broadened its use for creative and studio work, while the leaf-shutter lenses and full flash sync keep it practical for portrait photography. The square frame and waist-level finder suit deliberate composition, and the fixed body keeps the system simpler than a modular studio rig.
Test each lens leaf shutter for accurate speeds, since these are the timing mechanism and can be hard to service. Check the film-wind mechanism, a known weak point on Kowa bodies, and the multiple-exposure function. Inspect the film-path seals, mirror, screen, and waist-level finder mirror, and confirm foam seals have not perished.